The New Sudoku Players' Forum

by **Cenoman** » Thu Mar 26, 2026 4:45 pm

Weekly Extreme of this week:

Code: Select all: +---+---+---+ |316|58.|72.| |...|.6.|.3.| |...|...|..1| +---+---+---+ |..8|.37|...| |.7.|...|.9.| |...|42.|...| +---+---+---+ |1..|...|...| |.5.|.7.|...| |.67|.53|214| +---+---+---+

31658.72.....6..3.........1..8.37....7.....9....42....1.........5..7.....67.53214
Source: www.sudoku.org.uk

by **jco** » Fri Mar 27, 2026 12:15 am

After basics

Code: Select all: ,---------------------------------------------------------------, | 3 1 6 | 5 8 4 | 7 2 9 | | 24589 2489 2459| 7 6 1 | 458 3 58 | | 7 48 45 | 3 9 2 | 4568 4568 1 | |-----------------------+-----------------+---------------------| |d(9)2456 A[9]24 8 |B[9]6 3 7 | 1 456 256 | | 2456 7 2345| 68 1 58 | 34568 9 23568 | |d(9)56 c(39) 1 | 4 2 589 | 3568 5678 35678 | |-----------------------+-----------------+---------------------| | 1 b(9)38 a(39) | 2 4 689 | 5689 5678 5678 | | 24 5 24 | 1 7 689 | 3689 68 368 | | 8-9 6 7 |C[9]8 5 3 | 2 1 4 | '---------------------------------------------------------------'

Almost Grouped M-Wing

[(9=3)r7c3 - r7c2 = (3-9)r7c2 = (9)r46c1] = (9)r4c2 - r4c4 = (9)r9c4 => -9 r9c1; ste

by **pjb** » Fri Mar 27, 2026 12:23 am

Code: Select all: 3 1 6 | 5 8 4 | 7 2 9 2458-9 2489 h2459 | 7 6 1 | 458 3 58 7 48 45 | 3 9 2 | 4568 4568 1 ------------------------+----------------------+--------------------- 24569 249 8 |c69 3 7 | 1 456 256 2456 7 f2345 | 68 1 58 | 34568 9 23568 56-9 e39 1 | 4 2 d589* | 3568 5678 35678 ------------------------+----------------------+--------------------- 1 389 g3-9 | 2 4 689 | 5689 5678 5678 24 5 24 | 1 7 689 | 3689 68 368 a89 6 7 |b89 5 3 | 2 1 4

(9)r9c1 = (9)r9c4 - (9)r4c4 = (9)r6c6 - (9=3)r6c2 - (3)r5c3 = (3-9)r7c3 = (9)r2c3 => -9 r26c1, r7c3; stte

Phil

by **SteveG48** » Fri Mar 27, 2026 7:40 pm

Code: Select all: *--------------------------------------------------------------------* | 3 1 6 | 5 8 4 | 7 2 9 | | 24589 e2489 d2459 | 7 6 1 | 458 3 58 | | 7 e48 45 | 3 9 2 | 4568 4568 1 | *----------------------+----------------------+----------------------| | 24569 f249 8 | 6-9 3 7 | 1 456 256 | | 2456 7 2345 | 68 1 58 | 34568 9 23568 | | 569 39 1 | 4 2 589 | 3568 5678 35678 | *----------------------+----------------------+----------------------| | 1 dcd389 cd39 | 2 4 689 | 5689 5678 5678 | | 24 5 24 | 1 7 689 | 3689 68 368 | |b89 6 7 |a89 5 3 | 2 1 4 | *--------------------------------------------------------------------*

9r9c4 = r9c1 - r7c23 = 9r3c3&(38)r7c23 - (8|9=24)r23c2 - (2|4=9)r4c2 => -9 r4c4 ; ste

by **Cenoman** » Sat Mar 28, 2026 3:14 pm

Thanks for your solutions. Same kind for mine:

Code: Select all: +------------------------+------------------+-------------------------+ | 3 1 6 | 5 8 4 | 7 2 9 | | 24589 2489 2459 | 7 6 1 | 458 3 58 | | 7 48 45 | 3 9 2 | 4568 4568 1 | +------------------------+------------------+-------------------------+ | a24569 a249 8 | b69 3 7 | 1 456 256 | | 2456 7 2345 | 68 1 58 | 34568 9 23568 | | 56-9 e3-9 1 | 4 2 589 | 3568 5678 35678 | +------------------------+------------------+-------------------------+ | 1 e389 39 | 2 4 689 | 5689 5678 5678 | | 24 5 24 | 1 7 689 | 3689 68 368 | | d89 6 7 | c89 5 3 | 2 1 4 | +------------------------+------------------+-------------------------+

(9)r4c12 = r4c4 - r9c4 = (9*-8)r9c1 = (83)r67c2 => -9 r6c1*, r6c2; ste

WE#1018